研究目的
To develop a wireless communications link using subterahertz frequencies with FET-based detectors for data transmission.
研究成果
The experimental THz communications link successfully achieved error-free data transmission at rates up to tens of Mbps using 170 GHz and 289 GHz carrier waves. This demonstrates the feasibility of FET-based detectors for short-range wireless applications, with potential for future improvements in bandwidth and integration.
研究不足
The study was limited by the available equipment, with data rates capped at 50 Mbps due to equipment constraints. High absorption in the atmosphere at THz frequencies and the need for high output power for long distances were also limitations. The research is in an early stage, and higher data rates (e.g., Gbps) were not achievable with current resources.
1：Experimental Design and Method Selection:
The study involved designing a prototypical THz communications link using ASK modulation, focusing on FET-based detectors and readout circuits. Theoretical models included Dyakonov and Shur theory for plasma wave rectification in FETs.
2：Sample Selection and Data Sources:
A GaAs HEMT detector fabricated by UMS was used, integrated with an on-chip antenna and silicon lens. Data was generated using a pattern generator based on DS1085 frequency synthesizer.
3：List of Experimental Equipment and Materials:
Equipment included a VDI THz source, pattern generator, digital oscilloscope, silicon lenses, PCBs, metal enclosures, and dedicated readout ICs. Materials involved GaAs HEMT detectors and off-the-shelf components.
4：Experimental Procedures and Operational Workflow:
The setup consisted of a transmitter with THz source modulated by a pattern generator, and a receiver with detector, silicon lens, and readout circuit. Tests were conducted at 170 GHz and 289 GHz with modulation frequencies from 1 MHz to 25 MHz, measuring received signals and eye diagrams.
5：Data Analysis Methods:
Data was analyzed using eye diagrams and signal plots from a digital oscilloscope to assess transmission quality and error rates.
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